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Stockholders' Equity and Share-Based Awards - Summary of Changes of Restricted Stock and Restricted Stock Units (Detail) - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock Based Compensation [Abstract]      
Restricted Stock Units, Outstanding Shares, Beginning of Period 4.4    
Restricted Stock Units, Granted, Shares 2.8    
Restricted Stock Units, Vested, Shares (1.2)    
Restricted Stock Units, Forfeited, Shares (1.3)    
Restricted Stock Units, Outstanding Shares, End of Period 4.7 4.4  
Restricted Stock Units, Outstanding Shares, Expected to vest, End of Period 2.9    
Weighted-Average, Outstanding, Beginning of Period $ 50    
Granted, Weighted-Average 29 $ 47 $ 54
Vested, Weighted-Average 44    
Forfeited, Weighted-Average 43    
Weighted-Average, Outstanding, End of Period 41 $ 50  
Weighted-Average, End of Period $ 32